Metallic arch for furnace-fronts



(No Model.) I y W. M. MATHISEN.'

. METALLIC ARCH P0P. FUR-MGB FRONTS. l

No. 576,872. Y Patented Feb. 9, 1897.

u mams rmns cumncrm-L No wnume'mu n c UNITED vSTATES PATENT OFFICE.

W'ILLIAM M. MATI-IISN,

OF CHICAGO, ILLINOIS.

METALLIC lARCH FOR FU RNACkE-FRONTS.

SPECIFICATION forming part of Letters PatentNo. 576,872, dated February9, 1897.

Application tiled June 29, 1896. Serial No. 597,272, (No model.) i

To all whom, it may concern:

Be it known that I, WILLIAM M. MATHIsEN, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois,haveinvented certain new and useful Improvements in Metallic Arches forFurnace- Fronts; and I do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

A My invention relates to a novel construction in a metallic arch forsupporting the brick or tile furnace-fronts of boilers, the object beingto provide a device of this description which will not warp or burn outand will support the wall over the fire-door.

My invention consists in the features of construction hereinafter fullydescribed and claimed.

In the accompanying drawings, illustrating my invention, Figure l is afront elevation of a furnace-front provided with a metallic archconstructed in accordance with my invention. Fig. 2 is a verticalsection of the same, taken on the line 2 2 of Fig. 1. Fig. 3 is a topplan view of the arch.

Heretofore it has been customary to construct the front wall of thefurnace of a boiler outside of the lire-brick lining l of brick orhollow tile. These are sometimes supported by an iron bar and sometimesby an arch formed by the tile.A The intense heat to which the iron barand the brick or tile are subjected usually results in causing theformer to warp and the latter to crack, so that in a short time the wallbecomes weak and must often be renewed. To overcome these difficulties,I provide a metallic arch comprising a plate.2, provided Vupon its loweredge with end fianges 3 and middle flanges 4, placed equidistant fromeach other. The extent of each of said flanges where subjected to theheat is insufficient to permit warping tc any considerable degree, andin practice I find that the same do not warp. Said middle flanges 4 arepreferably of greater width than said end flanges 3, and are furthersupported by braces 5 at their middle portions. Said end flanges 3 restupon the wall at each side of the fire-door and thus support the arch.

The outer face of the plate 2 is placed flush with the outer face of thewall and said ilanges extend inwardly therefrom. The length of saidlianges is slightly less than the width of' a brick, so that a bricklying upon the same willextend beyond the inner edge of the same. Thelower faces of said fianges are also beveled at their edges, so as topresent no sharp projecting corners to the action of the heat. Theheight of the plate 2 is preferably equal to the height of three bricks.

In practice, after the wall of anyvdesired thickness has been built tothe height of the top of the fire-door an arch is placed thereon whichwill support the fire-brick lining. A second arch is placed in front ofthis to accommodate another width of brick, and another to accommodate athird, and so on, according to the thickness of the wall. The distancebetween the ribs 5 is equal to the length of one brick. After saidarches have been placed in position the spaces between the same arefilled with three courses of brick, or more or less, according to theheight of the plate 2. These bricks serve to protect said plate 2 fromthe heat, but do not form any part of the front wall, as they carry noweight. After said spaces between said arches have been lled to the top,cross-courses of brick are laid so that their ends rest upon the tops ofthe plates 2 and the wall is then continued upwardly. In this manner theentire Weight is carried by said plates 2, while at the same time theyare protected from the heat, thus making warping impossible.

I claim as my invention- 1. A metallic arch for furnace-frontscomprising an upright `plate provided upon its lower edge with aplurality of flanges atintervals. I

2. A metallic arch for furnace-fronts comprising an upright plateprovided upon its lower edge with` end flanges and middle flanges, saidend flanges being adapted to rest upon the wall at the sides oftheVire-door, and said middle flanges being adapted to support bricks ortiles to protect said plate from the heat, and braces between saidmiddle flanges and said plate.

3. A metallic arch for furnace-fronts comprising an upright plateprovided upon its IOO lower edge with a series of flanges having. Intestimony whereof I affix my signature beveled edges. in presence of twowitnesses.

4. Ametallio arch for furnace-fronts eom- T prisng an upright plateprovided upon its VILLIAM M' MATHISEB' 5 lower edge with end anges andmiddle lVitnesses:

RUDOLPH WM. LoTz,

flanges having beveled edges, and braces between said middle flanges andsaid plate. E. J. BOILEAU.

